A 2.6 ghz difference in freqs is more than adequate spacing to prevent interference (600mhz difference). The watch's antenna shouldn't even "see" a 5ghz signal. I think the problem arises when your ant device (like a p2m) is broadcasting @ say (hypothetically) 2.450ghz (2450 MHz) and your router is broadcasting to a device close to you or with enough power to drown your ant signal at like 2.452 ghz (2452 MHz). In my mind, a 2 MHz spacing difference should be more than adequate (especially as how tenths, hundredths, and thousandths of a MHz are distinguishable by many radios) but it appears it's not? Also, it looks like each wifi channel as an affective freq width 22 MHz wide. Which is crazy to me. I'm not going to get into the power issue because it's way to early for milliamps, watts, dbm, and Ohm's law. Plus, I need to get to the pool. Keep in mind that I'm not an engineer nor particularly science savy but I have a lot of experience working with radios. If any engineer is reading this, and I'm I'm really off track, my apologies. There's a reason why FM is referred to as "F@cking Magic". Sometimes it works sometimes it doesn't... There's like magic crystals in there vibrating and pumping out cadence, power, and heart rate... And porn or my little pony or w/e on your tablet...